[gparted] Fix ignoring return value compiler warning

[Curtis Gedak <gedakc src gnome org>]

commit 026d0bd34b8721d941deea12128ee684b2bebaa9
Author: Curtis Gedak <gedakc gmail com>
Date:   Sat Jul 16 09:19:29 2011 -0600

    Fix ignoring return value compiler warning
    
    Add code to handle situation where mkdtemp(char*) function returns
    with a NULL value.  Prior to this code the compiler would complain
    with the following message:
    
    error: ignoring return value of âchar* mkdtemp(char*)â, declared with
    attribute warn_unused_result

 src/Dialog_Rescue_Data.cc |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)
---
diff --git a/src/Dialog_Rescue_Data.cc b/src/Dialog_Rescue_Data.cc
index 47c6323..7e2e22d 100644
--- a/src/Dialog_Rescue_Data.cc
+++ b/src/Dialog_Rescue_Data.cc
@@ -1,4 +1,5 @@
 /* Copyright (C) 2010 Joan LledÃ
+ * Copyright (C) 2011 Curtis Gedak
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -22,6 +23,7 @@
 #include <gtkmm/stock.h>
 #include <gtkmm/checkbutton.h>
 #include <sstream>
+#include <cerrno>
 
 namespace GParted
 {
@@ -159,7 +161,24 @@ void Dialog_Rescue_Data::on_view_clicked(int nPart)
 
 	char tmpDir[32]=tmp_prefix;
 
-	mkdtemp(tmpDir);
+	char * tmpDirResult = mkdtemp(tmpDir);
+	if ( tmpDirResult == NULL )
+	{
+		Glib::ustring error_txt = _("An error occurred while creating a temporary director for use as a mount point.");
+		error_txt += "\n";
+		error_txt += _("Error");
+		error_txt += ":\n";
+		error_txt += Glib::strerror( errno );
+
+		//Dialog information
+		Gtk::MessageDialog errorDialog(*this, "", true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
+		errorDialog.set_message(_("Failed creating temporary directory"));
+		errorDialog.set_secondary_text(error_txt);
+
+		errorDialog.run();
+
+		return;
+	}
 
 	Glib::ustring mountPoint=tmpDir;